这段代码如何优化？

Question

public void run() {
    try {
        WsRequest req=new WsRequest(xmlText);
        System.err.println(req.getCode());
        System.err.println(req.getNodes("MoSms"));
    } catch (Exception e) {
        e.printStackTrace();
    }
}

上面这段代码是每隔30秒就执行一次的。也就是说WsRequest对象一直被new这样子会影响内存和系统性能，如何优化这段代码呢？

Answer 1

单例模式：
[code="java"]public class Singleton{
private Singleton(){
generator = new Random();
}
public void setSeed(int seed){
generator.setSeed(seed);
}
public int nextInt(){
return generator.nextInt();
}
public static synchronized Singleton getInstance(){
if (instance == null) {
instance = new Singleton();
}
return instance;
}
private Random generator;
private static Singleton instance;
}
客户端调用的代码：
package singleton;
public class Client{
public static void main(String[] args){
Singleton s1 = Singleton.getInstance();
System.out.println(s1.toString());
for(int i=0;i<10;i++){
Singleton s2 = Singleton.getInstance();
System.out.println("The randomed number is "+s2.toString());
}
}
}[/code]